Electric switch.



T. E. MURRAY'.

ELECTRIC SWITCH.

APPLICATION FILED NOV. 27, 1912.

1,091,155. Patented Mar.24,1914

2 SHEETS-SHEET 1.

Patented Mar. 24, 1914.

2 SHEETSSHEET 2.

. ication.

THOMAS E. MURRAY, or` NEW YORK, N. Y.

' ELECTRIC SWITCH.

. specification of Letters Patent.

Patented Mar.'24,1914.

Application led November l1W, 1912. Serial No. 733,781.

To all whom it may concern:

` Be it -known that I, THOMAS E. MURRAY, a citizen of the United States,residing at New York, in the county of.New York and State of New York,have invented a certain new and useful Improvement in Electric Switches,of which the following is a speci- The invention is an electric switch,'constructed to close circuit between termlnals vthrough a main fuse,and thereafter to connect a' second fuse in parallel with said mainfuse.

The invention consists in the construction, hereinafter -set forth,whereby 'sald swltch 4may be operated to cut said fuses successivelyinto circuit, and whereby access to the switch is prevented when thecircuit is closed. In the accompanying drawings F1 ure l 1s a sideelevation, showing the mova le portion of the switch raised to opencircuit, and also the protective casing. Fig. 2 is a transverse sect-ionthrough the fixed and movable portions of the switch. Fig. 3 shows inelevation and partial section the position of the parts of the switchwhen the circuit is closed through the main fuse only. Fig. 4 shows theposition of the parts of the switch when the circuit is closed throughboth fuses. Fig. 5 is a top view-of the device on a re- Y duced scale.In Figs-2, 3, and4 the protective casing is omitted.

Similar numbers of reference indicate like parts. a

The fixed part of the switch comprises a base block 1, preferably ofporcelain or other refractory insulating material, secured inanysuitable way to the bottom of the inelosing metal casing 2. In saidblock is a longitudinal recess, in which arel disposed spring clips 3,4, to which clips the terminals of the line conductor 5 are connected,said conductor entering the casing through openings in its end walls.The spring clips are alike and are constructed 1n vthe following manner:The clip 4 comprises a metal plate 6 which is bent back on itself at 7,then upwardly and then downwardly, as shown at 8, to form one arm of theclip.

Said plate is secured upon the bottom of the recess in the base block bya screw bolt 9 passing through the bent back portion at 7. Another metalplate 10 is placed upon plate 6 and bent upwardly and then downwardly,as shown at 11, to form the other arm of the clip. This plate is securedVin place by a screw bolt 12 which passes through both plates. Theterminals of conductor 5 are provided with metal end pieces 13, havingat proJecting plates 14 which are secured by the screws 15 to the upperplates, as 10, of said clips.

The movable part of the switch is constructed as followsz' 16 is acarrier of porcelain or other. refractoy insulating rnateial, suspendedon two rods 17, 18, placed as shown in Fig. 3. Said rods pass looselythrough openings in the cover 19 of casing 2 and in bosses 20 `on theunder side thereof, and are connected above said cover by a bar 21.Surrounding said rods and interposed between minals of a main fuse strip28 are interposed between the lower members of the loops 26 and plates29, and are secured by screw bolts 30 passing through said plates 29 andloops 26 and entering bars 27. The-body portion of the fuse strip formsa loop with parallel arms which extends upwardly through an opening inthe bottom of carrier 16 into a recess 31 in said carrier. At the bend32 of said loop said strip is carried through an opening in a partition33, offiber or other insulatmg material, which partition extends downbetween said parallel arms.

On carrier 16 are` two contact plates '34, l35, which are bent to lieagainst the upper surface of said carrier, and against the walls andbottom of the recess in said carrier. Said plates are secured in placeby Vthe screw bolts 23. Above the carrier 16 and vbetween l the blockand the bosses .20` is a second Vearrier' 36, of porcelain or lotherrefractory insulating material, 'having an opening 38. Extending acrosssaid carrier :and above the opening 38 is a bar 37, through which passesthe threaded end of a rod 39, said end being secured to said bar by anut. The rod 39 passes loosely through openings in the cover 19 and thebar 21, and on its up-A per end has a head 40, between which and saidbar is a helical spring 41 which normally keeps the carrier 36 inelevated position and separated from the carrier 16, as shown in Fig. 3.On the under side of carrier 36 are two. Contact plates 42, 43, whichregister with the contact plates 34, on carrier 16. .Secured to saidplates and extending across the opening in carrier 36 is a fuse strip44.

In order to break circuit between the ter-v minals of line conductor 5,.the carriers 16 and 36 are both raised by hand, the contact plates 24,25 being then withdrawn from the spring clips 3, 4, as shown in Fig. 1,and supported in their raised position by helical springs 22. In orderto establish circuit through the main fuse 28, the bar 21 is pushed downto engage the plates 24, 25 into said clips, as shown in Fig. 3. Inorder to establish circuit also through the second fuse 44, the rod 39is pushed down until the contacts 42, 43 on carrier 36 meet the contacts34, 35 on carrier 16. The two fuses 28 and 44 are then in parallel.

As an illustration of a use of this device; in starting a` motor,circuit may first be closed through both fuses 28 and 44 to take theinitial rush of current, and then after the motor has started, the fuse44 may be raised out of circuit, leaving only the main fuse 28 inaction. The cover 19 is downwardly flanged on both sides, and at oneend. Its other end, when said cover is placed upon the casing 2, passesunder a flange 45, Fig. 1, on the end wall of said casing. In the endflange is an yopening toy receive a slotted projection 46 on saidcasing, which projection receives a seal fastening 47. It is to be notedthat even after the seal fastening has been removed, the cover cannot betaken from the casing unless the plates 24, 25 are raised out of thespring clips 3, 4. Then said cover can be slid oft the casing in thedirection from right to left of Fig. 1.

I claim.:

l. An electric switch, comprising a support, circuit terminals thereon,a hollow nu vable carrier, a fusein said carrier having terminals on theexterior thereof coperating with said circuit terminals, a secondcarrier. movable independently of said first carrier, and a fuse on saidsecond carrier having its terminals coperating with the fuse terminalson said first carrier.

2. An electric switch', comprising a support, circuit terminals thereon,a hollow movable carrier, two pairs of contacts thereon, the members ofeach pair being connected, a fuse in said carrier connected to saidpairs, a second carrier movable independently of said first carrier, anda fuse on said 'second carrier having its terminals coperating with amember of each of said pairs of contacts; the remainingmembers of saidpairs cooperating with said circuit terminals.

An electric switch, comprising-an inclosing casing, fixed circuitterminals therein, a movable carrier, contacts on opposite sides of saidcarrier, rods extending from said carrier through a wall of said casing,a connecting device for 'said rods outside of said wall, springsinterposed between said device and said wall, a second movable carrierinterposed between said first carrier and said wall, contacts on saidcarrier, a rod extending from said second carrier through said wall andconnecting device, a head on said rod, and ,a spring interposed betweensaid head and said connecting device.

4. An electric switch, comprising a casing, avslidable cover thereon,means for preventing lifting of said cover from said casing, amovable-switch member supported on y said cover, and a fixed switchmember engaging with sa1d movable member and disposed within sa1dcasing: whereby upon the engagement of said switch members remoral ofsaid cover from said casing by slidmg as aforesaid 1s prevented.

In testimony whereof I have affixed my signature in presence of twowitnesses.

THOMAS E. MURRAY. Witnesses:

GERTRUDE T. PORTER,

MAY T. MGGARRY.

